Anybody who has been a teacher at a kindergarten in Japan (or anywhere the world, in fact) will tell you about the countless nightmares associated with teaching children. From the horribly contagious colds at least one kid seems to have year-round, to all the gross bodily fluids flying around.

But, there is an upside to being left alone in a room full of impressionable children day after day: you can have them put on the cutest rendition ever of “Dayman,” from the American sitcom It’s Always Sunny in Philedelphia.

For reference, here is the original. We hope this teacher left out the drug references when he taught his kids: